Ventilation fan



FIG. 1 is a rear view of a ventilation fan according to a firstembodiment of the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a front perspective view thereof;

FIG. 6 is a rear view of a ventilation fan according to a secondembodiment of the present invention;

FIG. 7 is a rear perspective view-of the embodiment of FIG. 6 ;

FIG. 8 is a side view of the embodiment of FIG. 6 ;

FIG. 9 is a front view of the embodiment of FIG. 6 ;

FIG. 10 is a front perspective view of the embodiment of FIG. 6 ;

FIG. 11 is a rear view of a ventilation fan according to a thirdembodiment of the present invention;

FIG. 12 is a rear perspective view of the embodiment of FIG. 11 ;

FIG. 13 is a front view of the embodiment of FIG. 11 ;

FIG. 14 is a front perspective view of the embodiment of FIG. 11 ;

FIG. 15 is a side perspective view of the embodiment of FIG. 11 ;

FIG. 16 is a rear view of a ventilation fan according to a fourthembodiment of the present invention;

FIG. 17 is a rear perspective view of the embodiment of FIG. 16 ;

FIG. 18 is a side view of the embodiment of FIG. 16 ;

FIG. 19 is a front perspective view of the embodiment of FIG. 16 ; and,

FIG. 20 is a front view of the embodiment of FIG. 16 .

The broken lines illustrate portions of the ventilation fan that form nopart of the claimed design.

CLAIM The ornamental design for a ventilation fan, as shown anddescribed.